patch 8.2.3854: Vim9: inconsistent arguments for test functions

Problem:    Vim9: inconsistent arguments for test functions.
Solution:   When :def function and script have different arguments use a list
            with two items instead of a separate function.
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 9251266..d17d010 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -491,7 +491,7 @@
 enddef
 
 def Test_call_white_space()
-  CheckDefAndScriptFailure2(["call Test ('text')"], 'E476:', 'E1068:')
+  CheckDefAndScriptFailure(["call Test ('text')"], ['E476:', 'E1068:'])
 enddef
 
 def MyDefaultArgs(name = 'string'): string